nav{
    width: 1200px;
    height: 88px;
    margin: 0 auto;
    ul{
        list-style: none;
        display: flex;
        align-items: center;
        li{
            flex: 1;
            text-align: center;
            height: 88px;
            line-height: 88px;
            border: 1px solid red;
            a{
                text-decoration: none;
                display: block;
                &:hover{
                    background-color: skyblue;
                }
            }
        }
    }
}